Lederman and Maloney examine the empirical relationships between trade structure and economic growth, particularly the influence of natural resource abundance, export concentration, and intra-industry trade. They test the robustness of these relationships across proxies, control variables, and estimation techniques. The authors find trade variables to be important determinants of growth, especially natural resource abundance and export concentration. In contrast with much of the recent literature, natural resource abundance appears to have a positive effect on growth, whereas export concentration hampers growth, even after controlling for physical and human capital accumulation, among other factors.